[l10n_it_account] fix error on multiple creation
[l10n_it_account] fix error on multiple creation

odoousers2014/LibrERP,dhp-denero/LibrERP,iw3hxn/LibrERP,dhp-denero/LibrERP,odoousers2014/LibrERP,odoousers2014/LibrERP,dhp-denero/LibrERP,iw3hxn/LibrERP,iw3hxn/LibrERP,dhp-denero/LibrERP,iw3hxn/LibrERP,dhp-denero/LibrERP,odoousers2014/LibrERP,odoousers2014/LibrERP,iw3hxn/LibrERP